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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad99da915a9a21fa568ff1358208dc5096629ad804d615caf281ab0953a5a39f' 
  AND token = 'oHl8bxCKlNZkNgJEZV6mcIaxbayKq+jn5STnC2NpSz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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