Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29123439386e74bd36d087e1e5bb5174d6f44140f50395f608e3d3f0b2917740' 
  AND token = 'RpfMBwJHCP2x34dNNPwCGpo+kLfsAXVNu4eccPsIBEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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