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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5eedadab4b059c843a30a437d6e2b089cafef5b3c3426e28f3a3df50e0e3fd9e' 
  AND token = 'mR0iZObjvyZrYUkETnHWqBdIgOxgRdKoCh4JOuFXSqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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