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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '47877b9da736273f494d05935ca43f0e5e424060ce28d0e4dfc7e83031e46fcf' 
  AND token = 'D6413s66XsSgyFO63SKdhjNE1W84qgIykI1jxK4EYXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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