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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a1637395492d42455be350cb86032749c3c95dc6649c7ebe94e639c2df4ae94b' 
  AND token = 'jJBP65cVzmIgXtJhk7PYLyycIS3FGhLYq3Xlj67lrUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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