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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4057e7ef2bafca64bef3de9092c5753f5c9c86c91a17b1479fd984faf73bcdd' 
  AND token = 'cAPcuhqmZ1FyjcrWHbjZcZu8UsnpAvEEIf94QCPpP5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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