Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3815a9e7db907dd35190532f40bd761553287e36466372aa8e4889275eba83' 
  AND token = 'HLOmikY2lk8R1EgihLhwhyFuFsgfhPFyAjrpNkTkwUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}