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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c429a05f36fdbf0d739ba26ec5e7763ec3434910fee024157bfeeb7929082c71' 
  AND token = '6rob51yOcUJ0pX0VcS454H34pTvAyYhLQdeleu/XW+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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