Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c624350d7f2d8fe27b7f978cbe910984520bcf440b77ed0ebf3869d99451a0' 
  AND token = 'g8uNTnnlMzQEwVCANw3uUNRcFXGChn+iYNuCxeIhYLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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