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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4f654f7a6e5b1dbeecff6f5eadc61e70bfa2f3b8e0758cd6156c9f485e7f7a23' 
  AND token = 'jX0xuCq7xEHb7bWkAWuElJDduqw8OBX5hguhFOnMAhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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