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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72aff2ec7c8d7be61eb8e0a014c44115815673521a71a93c5e543b3ae24c92b1' 
  AND token = '9gRNOsJlf2HLGcCzwL+H/JKQRc7MByUgVE1aX9ou+dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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