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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f587bf831bdc901e7a4cfb4720f79c2f7a674041ac6ca9a43ca3844fbab3df3' 
  AND token = 'cgjsdJD90q9zrA6fE/llcdrcme2+0otkqrRdRBMa9UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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