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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65b444119e4e713b2e99358b17d2c6ac2e7e15aa6c8e7f59669eac978f3fc61b' 
  AND token = '5SxIEemPy630+fgCBGwAHBZ8NGrH8uDULG7riMNpcfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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