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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9f4348fbf377ccd4eea67293fd22e2612b5a07f12947bcc305093eebf074364e' 
  AND token = 'bcsfHkNOX6BVGOgd0DEOg+bXx9zinQTfEP1pB4rgsQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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