Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8638d56d3947c122606a45af12e61eb3f5036434775eabfbc2221ccd01aa82' 
  AND token = 'CcwEcDqmTNvGj6bVVArXJ/1F13Nowzd7f4rmTh+hwcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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