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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d7f19e462ae56fb41bc08fc0b9accce3e0d61e899c5dacb690c52d8be2b463f' 
  AND token = 'XvpwoddZ0chT3fkKpwhNU3vQmCC6J3+SxJsZmSue9MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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