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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd00383b85fbfea1b42afd6b000a3497d00ef4d36297f64f6de300cec3ba4f847' 
  AND token = 'c3qGnYq4q0JJ0xq4MmdBzpgTRlC6f+bw2mdif7z+jgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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