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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a339bfe1abb4e1acce33119335d1ce182021d8386786fe43ae15b1202d39686' 
  AND token = 'cabDRjGCvIzdf1Q0yLGYBI1p0f2mO/LVYmz1JiW8/yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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