SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7b213ad4664267fe7268875c2c2cc6fdf4db8cac4dad9aa3ca2d0c72f986a450' 
  AND token = '96T5qT7UPgyOG2dUqYzxdjgKpVqCWQ0u90Bkw90VzKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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