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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd136b3bc44e00e3fae8668c23aa6abb74a77cbb90e7befaa48da6725c8d43b9b' 
  AND token = 'aobyJMraHnwj5gEQra6Il+l/q7Zl6NnY/h4v/VRMc1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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