SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd077f1c5e1960f4b4c3dfc103f6b703223bb9c26e83f824c3aad236b3ca4aed6' 
  AND token = 'LwYgo2cDJYd9friEr4280Ft5PuhlyPziBhhGF+UeJJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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