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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5c299652e211226d8310fe8cd9c14050746b9703a86d6148e7990016865d828c' 
  AND token = 'DXQzWPouaoJ6sUZ+feKVPt9w8Y9blfXZUFggXc6lWTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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