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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '116cc21ac43b86ed75707d8b8d9a3c1d1e4fcc8fbf56abae39a958a93bd653f1' 
  AND token = 'g3gGd+rO8hhSLauR+5k3M9Hc4jG1Gv2eD+D/e2NCpeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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