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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d7efba76bc1ab9d89c1d6bf37e33ce55e94048961089c793d496353873aeb4a' 
  AND token = 'cYuQpShDeuCUcd4voWypFJdDvmlVw6sAkyKxw0W0pGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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