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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '829b0346ab3ab25b9a656263f3f63e0d3f0dd8e7a7d481385048d549dfc14cc9' 
  AND token = '8MAnPWyRJwsgsnCR6naIoNwDukuxO41NQyI3om1d3iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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