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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9bd856bd75d124463e97cf3575b001c2e48f256e770b5e616de4eb995a778164' 
  AND token = 'awArulTP9Wt2WFsf418bdMuhWtK0XCC1fgYdoVzX8mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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