Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb69da2bbb3d649292a6b7fca939a4a668b0fc4b0ec2acafc109fc321a9159d4' 
  AND token = 'U0AK1KiQX93/Sw0hs+FE2ZjguRXX04rvLdVnE2utMJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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