Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa5389fa49cb3ee2c1bb74c881fcde966b82da0d34d35443c551489fb0c3b3c' 
  AND token = 'Hg6rz9kvue7vV7CCOZ6MZ+xcKNKueu8gkaciUceCFho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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