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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '701a9616edd006ab0ac2ce41f5fa8069267773f69b694a7b99c5cf3f7fd4cafd' 
  AND token = 'bHnP1mXkOxp3dZH+FhapieuVrXEU0k8x3calTBOg1kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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