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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '91edb76c5a1124cb1e5099cea76d1a4226e91816f81a7c9b6d5b08d3e33c7fcc' 
  AND token = 'sd19wdJKPA1Xwg1I9t8gCsKATJ01YjQ8kTfQ7zrXGIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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