SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '06130b8a378a44c3edd386c72e769d7b9db0592b1a68d1369e6f1a9d4b94c830' 
  AND token = 'u1h0+9S71xSTeGxHNzjPote6+vwRShmWsAFwPsxAJVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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