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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a9ace82610f83cc9939fadcf5d157174057e145e968c248477e9b7caf1820dbb' 
  AND token = 'PxcA+Ku/+0jeSqKHA0FR5gbQztDZPZAH+uEYAcRUASE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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