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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bac3cee958e4f113456f12a10c97502e3b8250b73376d4eecb03f9535b0e8547' 
  AND token = 'wvk7Ue4HS2Ur68yka5WwDkSMK6zKNDEvn3m0SRzXEXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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