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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a2fdf4771f18bb3339d96a6367d04dc3e3daea348378c7bc6d8aa346a15c927' 
  AND token = '23CtEKHUB/gQT/SXUZu3noJeSnTCWcDoDPsFfZ6kZKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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