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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c5269217d37bf708c0c54eddf29725f13288a8c04e3a9471fbef29d356c61d69' 
  AND token = 'bJ4WvQ2orIPc6EJTwa9bylZSl2/8p5Wms3L7g55TqyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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