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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '62f3b08787cb82da69eaf22ac6937e4bf0681610de6e70ace306e86b217822a7' 
  AND token = 'W5VnGued+V6oxqDgyp+i3UR9tx9YiDGML0/iMVIYVJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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