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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f3a5b71785edb4d8a9b950a65b48cd090ae134207e8b18ac79bc4552909e003e' 
  AND token = 'CcjnRfv1U2rqboTu8hjjXJ1HT4cIdDG5c3qSaLAtI6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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