Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '657c54b7d2981f587df6a58909bb172512ce29f33b84f6de1705fae0f667d72d' 
  AND token = 'OFPKHL5Gy8uOWp6VOeRMS3Okr4xrl/INxP0bAdwT1GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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