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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a63fc864e342c21907154e15abf4c0c72913e656343dbd634752b49d840110cf' 
  AND token = 'Vxw18QUuip80U5aGGWEOc32YG0BBOif9mtXxkKNKTiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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