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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f14829234aec21705d385831e98ac97b6405f5a721ce09e7641156779d2d6c40' 
  AND token = 'xG6sxNSm9UJa3zcsNt0B1q5FGZJGNOKH9qODGd3ZpbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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