Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab6aa4cddb9a50f1ca1351f0bc56771e46462ce9fe4fdd3b05fb34926ae5774' 
  AND token = 'G9RS7XzGwojcPLdtDAFPWxoETsTOg2fHlEDZjlLTKPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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