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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '99a7878c7a392512b03eae85cbcf9c35eec5be69897b9bf6673f08eb26696bd8' 
  AND token = 'l2f/byjnwCETw1g0Yqoz0OrbtSCRSs9GDC+gBPyqjcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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