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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '242f657ca0c0de2be91a8d04c0d0ca83e85c5524def4233fd3e923ad1e9b4a39' 
  AND token = '048YHgcRW+jVhRl6aCTuQJ698klSVZqrZWl2nnICYo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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