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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aeeb33b99ddd9bf25dcfa06f5bd34395ada7861285eebd5125e12fa0af7b5d12' 
  AND token = 'X3QTaa2wtj1aHvhNw5O7BcfkI6nI9qanOsCfHmQ/Poo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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