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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bf64dc16e18f6690e10ebdeb374f6f4c8e67233d45fe4bd68055d7b0a2dd7c97' 
  AND token = '+cfQGktkuIxbNT4szTiK/7HvhAk6Kriw14NzE52UWvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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