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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e00e31563f76312f0206feaa869064c41122c06dbd6f3424bfbbd5ae58fad440' 
  AND token = 'Qyo0nNW7xJbjuvIwVAc6Z922lbqiVFyqWw8aix3mq9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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