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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '811395638c39d2742214989dc43c9c48dbbd3d1342088c9d324f4227882e981a' 
  AND token = 'LrMtD/GoPFun0CL9WqShMDo7ooIcd6tPDH7FqpQeKF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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