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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1c50cd5a10f7c6d2576acc10bf7e67fe299b23bdfba4930dcc1e9b982722064b' 
  AND token = 'FLnf/tutz2VZXq7iAXQeTocVQkDmyBVmnLoCa+msIJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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