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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c70526633a99cf5d5adef41f3c4b68307f8d3d221777bdbab19c8f2b2b8597fa' 
  AND token = 'nAhdiZIaKSao8Ulebpu3JUlNp3A+autJkvRr3qTlKzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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