Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b345d2119d66789e5992d6af9a98ff25b33ad7e2ecad1cd1f72da80015516750' 
  AND token = '/9EQZqq/dxxbzbA45URPkMdmmU4IZ3Pbr/Q1rVm1qNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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