Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc7dcda103e2b8604f8aa0b129fa2a98ad15cecb8e06546a30ad33b99fa7c99' 
  AND token = 'i+Vf4WetzRa4Vd1Y0I5U/SXlod5+IVhC/KipoLU4VAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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