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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '20cc14f7ca4de87de5697e6a8ac452cc8fff33c005c967003b277826b7e680ec' 
  AND token = '1lIreFYOVzURgBpjMtl+K96kqJ2mcF8FpIena270pyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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