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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ffd1250223228e17df143cebd506b5c80e9db1810d8aef782707be312adf6d7d' 
  AND token = 'zJfwQpyUW6X+ycgYm4xen8z5jVP1j8KD5NuY1yVfxmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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