Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ccad7abb5bddbb9c35bc140eb01af51e12de6492a4ade0b1860a272bf79bd0' 
  AND token = '4cg6ZL4WjX1R+gem6rgdcstIpz5vqJMu3G3aR35o/0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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