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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5047064c6fc53a13e3f820f06f0be3148486c9ffc828ee463f1f65b224ff2668' 
  AND token = 'yBVrcdTxDWPR9UZWPCscsTVRLKUS/43+RcyfI6VFzjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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