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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '573cbc8c6bb5cf1d2fc6f80432d06b4c67f5fa86a054ab549200293b2c871049' 
  AND token = 'BBdRUoNxrWB2a74/DrhKR1hVOytk6GtwCGoRX7WBRdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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