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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47825433ed1329765e7f28927d723f08808d2e53cd466b52d20655c01e766d44' 
  AND token = 'jXZAEd+24uFt5H4f91j5cBXpWMWoMnT5YQrpN0KMHTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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