Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89d06f0e70fed31f7fe782a0315789a1aa6bcb1462a194dcbc1941a01a54114' 
  AND token = 'UCvGbXdNIzhDtRzzGeImIogIgLG5gHwGAY5wLYnTfm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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