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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d66e4ad3ee944c52eb88ee6fd2a8490c7630bde576303a46b27ad9d587df281' 
  AND token = 'TcfLFIVDicvxcWiktx+HN2/29n2w6A5MmDN30UqoifM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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