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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '399ec3e7c7d0eb4ac2d9685f8f579c38c622cf19f6de14a8f5954d285f4ec81b' 
  AND token = 'C+gpOyI7qizd0vCxVKAfEWKwMA+EcFdjTSLeP9eMgIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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