Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1a08bc1d3463511b44edd54af1ba04c63fddb1a9b2c6f7f65c962e9ec1e4dd' 
  AND token = 'FaRZ/WIdRKxRYodD7YW+aBlstb/rFTGWnEbPRL/HDL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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