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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aac88f31d3701499901496d1e9f875aabc5860f8cc8bbdfe8b5b637944d526cf' 
  AND token = 'Gu57N4SGcsjy9uf5rU4Zsl+4rbqofga0TwS0QkqV9Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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