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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3bb7d8c4d159b59fd4bf10eac2d5c84b231284dbe3baaab17b485a6d96888b57' 
  AND token = 'YEWc0aVvNwUwPAFtJGVDzW5PQtuq7sPVQHSf9yLgw1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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