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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70e35f5ffc3953ee1fef02a35d1118514efb480ab7a3dbfbe77b4d8a56d4cac5' 
  AND token = '7ABEv+LBN84hiLN9bDijdAzIACgynwnt4xRT3/ya+TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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