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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a17ae7679c9766206de08f228dfe68d19262b4700c3859a044285edf6f987d74' 
  AND token = 'ihy9N2c9/Lyyn+BXOh1WxRYFJop4HAgGyYtMERqEcio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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