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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '29c8c53d9ba6e5495957fc94fc220b988d5fa583ac9b574e4eb7dd4ddbc02306' 
  AND token = 'LSNgRXl9q8pWr127ydwD9K+PuEuiox/Hgj9KT88reus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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