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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9061fcc81b7591189ae74a2e9c9fe6cbd0e47406b56ad6bedca9cae2d10ae773' 
  AND token = 'Ls7cWIXKvgV5a0hPO7mBChk++SGmA78HU9slpDbWJ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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