Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd27d098f05a3b3c50e5e3ebcaf6015ed7e339bf746a3aceb7824a175abb1fe' 
  AND token = 'KrI9xlqVwRbOMcp7EvCel31JCZcZ4VrEvaV4DdFQ6mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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